E
E-mail
SEE: Electronic Mail.
E-mail Address
The address to which electronic mail is sent.
Earthfill Structure
A gravity structure made from gravel or other earthfill material.
East West Code
An indicator of the east-west direction of a measurement from an identifiable line; e.g., lease; boundary; block.
East West Distance
The East/West footage or distance that represents the length of a measurement from an identifiable line; e.g., lease; boundary; block.
Easting
The map projection grid coordinate of a point on a projection measured eastward (positive) from the north south line through the origin.
Ebulition Cooling
A method in which all heat picked up in engine jackets vaporizes the cooling water and the steam thus formed is subsequently condensed and recirculated through the engine. This method maintains the coolant at a constant temperature.
Eccentering Arm
An extendable device, sometimes a bow spring, which presses the sonde body against the borehole wall. Also referred to as: eccentralizer or decentralizer.
Eccentricity
A condition of pipe in which the OD and ID axes are not coincident, resulting in wall thickness variation around the circumference at a given section plane.
Echo
An indication of reflected energy.
Echo Amplitude
The vertical height of an A scan received signal, measured from base to peak or peak to peak.
Eco Out
SEE: Economic Out.
Ecological Impact
The total effect of an environmental change, either natural or man made, on the ecology of the area.
Ecology
The interrelationships of living things to one another and to their environment, or the study of such interrelationships.
Economic Interest
Any interest in minerals or reserves in place, in which the owner must look solely to the proceeds derived from the extraction of such minerals or reserves, (if, as, and when produced) for a return of his capital.
Economic Limit
The level beyond which operation of a producing property no longer yields sufficient cash flow for an element monetary profit. May be defined in terms of water cut, oil cut, gas-oil ratio, production rate, or other business or engineering factor.
Economic Limit Factor
The economic limit factor as computed.
Economic Limit Factor Standard Volume
The daily production volume per well at the economic limit.
Economic Out
Provision in gas purchase contracts which permits the purchaser to rescind contracts involving deregulated natural gas if prices of competitive fuels drop to the extent that distributors cannot compete in selling the gas. Also referred to as: ECO OUT.
Economizer
A distinct heat exchanger associated with refrigeration systems lowering the refrigerant feed temperatures to the chiller.
Ecosystem
The interacting system of a biological community and its nonliving environment.
Ecozone
(1) An ecostratigraphic unit.(2) A body of rock bounded by observable faunal changes.
Eddy Current
Circulating current caused to flow in the pipe by varying magnetic fields.
Edge Water
Formation water occupying the perimeters of an oil or gas reservoir.
Edi
SEE: Electronic Data Interchange.
Effective Beam Angle
That beam angle which, when plotted for a flat workpiece of the same thickness, accounts for the lengthening of skip distance which occurs in a curved test piece.
Effective Date
The date on which something becomes effective.
Effective Flange Breadth
The reduced breadth of a plate subjected to bending and/or tensile load, which, with an assumed uniform stress distribution, produces the same effect on the behavior of a structural member as the actual breadth of the plate with its nonuniform stress distribution. While the effective flange width applies to a member under compression, the effective flange breadth applies to a member under bending and/or tensile loading, and is associated with shear lag effects.
Effective Flange Width
The reduced width of a plate subjected to compressive load, which, with an assumed uniform stress distribution produces the same effect on the behavior of a structural member as the actual width of the plate with its nonuniform stress distribution.
Effective Injection Percentage
The percentage of fluid injected that goes into the zone of interest.
Effective Length
The equivalent length used in compression formulas and determined by a bifurcation analysis.
Effective Length Factor
The ratio between the effective length and the unbraced length of the member.
Effective Penetration
The maximum depth in a material at which the ultrasonic transmission is sufficient for proper detection of discontinuities.
Effective Permeability
A measure of the ability of a single fluid to flow through a rock when the pore spaces of the rock are not completely filled or saturated with the fluid.
Effective Porosity
The percentage of the bulk volume of a rock sample that is composed of interconnected pore spaces that allow passage of fluids through the sample.
Effective Radius
The characteristic radius used to quantify the behavior of a reservoir. This is the radius that a reservoir would have if circular in shape.
Effective Screening Area
Portion of screen surface available for material separation.
Effective Thread Length
Threads having fully formed roots, but not necessarily finished crests.
Effective Width
The reduced width of shell or plate which, with an assumed uniform stress distribution, produces the same effect on the behavior of a structural member as the actual width of shell or plate with its nonuniform stress distribution.
Effluent
A discharge of liquids and/or solids into the environment, partially or completely treated or in their natural state. Generally used in regard to discharges into waters.
Effluent Seepage
Diffuse discharge onto the ground of liquids that have percolated through solid waste or another medium; they contain dissolved or suspended materials.
Eft
SEE: Electronic Funds Transfer.
Elastic Modulus
The degree to which a solid body undergoes elastic deformation under stress.
Elastomer
Any of the class of materials, including natural and synthetic rubbers, which return to their original shape after being subjected to large deformations.
Elbow
A fitting that allows two pipes or nipples to be joined together at an angle of less than 180, usually 90 or 45 degrees. Also referred to as: ell.
Electric Controller
An electric control panel used for starting, cycling, or varying the speed of an electric motor that is rated by National Electrical Manufacturers Association (NEMA) size.
Electric Generator
A rotating machine together with its driver and associated switch gear used to generate electrical energy.
Electric Line
Single or multiple electrical conductor housed within a braided wireline.
Electric Log
A generic term used to refer to well logging of resistivities of the rocks surrounding the uncased borehole. Electric logs generally include a measurement of spontaneous potential (SP) generated within the borehole.
Electric Log Run Flag
An indicator of whether an electric log was run.
Electric Logging
The well activity of measuring resistivity and self potential properties of rocks immediately adjacent to the borehole by passing electrodes down the wellbore and inducing an electric current in the rocks adjacent to the borehole.
Electric Pilot
An instrument, used in well surveying, which utilizes an electrical current in connection with two fluids, a conductor and a nonconductor, to determine accurately the interface between the two fluids.
Electric Rig
A rotary drilling rig using electric power.
Electric Welded Pipe
Pipe having one longitudinal seam formed by electric resistance welding, or electric induction welding without the addition of extraneous metal.
Electrical Area Classification
Locations are classified according to API RP 500B: Recommended Practice for Classification of Areas for Electrical Installations at Drilling Rigs and Production Facilities on Land and on Marine Fixed and Mobile Platforms.
Electrical Condenser
SEE: Capacitor.
Electrical Cost
Costs include construction costs, wiring, poles, transformers, and generating equipment serving the booster station.
Electrical Enclosure
The case or housing of electrical apparatus provided to prevent personnel from accidentally contacting energized parts and to protect the equipment from physical damage. Certain enclosures also serve to prevent electrical equipment from being a source of ignition of flammable mixtures outside the enclosure.
Electrical Noise
Extraneous signals caused by externally radiated electrical signals or from electrical interferences within the instrumentation.
Electrical Stability
A measure of the quality of water emulsion within an oil based mud. The better the emulsion, the greater the electical potential difference required to pass a current through the fluid. Typically, a fluid which has the water fully emulsified; i.e., the oil is in a continuous phase, would require a potential difference of up to 1000 volts.
Electrical Survey
A generic term used to refer to specific electric logging, usually consisting of short normal, long normal, lateral resistivity curves and SP curves. Often used incorrectly to refer to borehole electric logs of other types.
Electrochemical
Chemical changes associated with flow of electric current.
Electrode
A conductor used to establish electrical contact with a nonmetallic part of a circuit.
Electrolyte
A substance which dissociates into charged positive and negative ions when in solution or a fused state and which will then conduct an electric current. Common electrolytes are: Acids, bases, and salts.
Electromagnet
Ferromagnetic material surrounded by a current carrying coil which becomes magnetized. Commonly abbreviated as: EM.
Electromagnetic Propagation Log
A well log that shows the propagation time and attenuation of electromagnetic energy through the rocks surrounding the borehole.
Electromagnetic Thickness Log
A well log of casing thickness as determined by using an array of electromagnetic transducers.
Electronic Casing Caliper Log
A survey which uses an electromagnetic noncontact method of relating currents induced on the inner surface of casing or tubing to the inner diameter of that casing or tubing.
Electronic Data Interchange
Commonly abbreviated as: EDI. The electronic exchange of business documents from the computer of one company to the computer of another company, in a standard format agreed on by both companies. Not all kinds of electronic communication with an outside company are considered EDI. For example, electronic messaging, e-mail, voice messaging, facsimile (fax), and telex are not considered EDI because they are free form and do not fit a standard format. The American National Standards Institute (ANSI) is dev
Electronic Funds Transfer
The electronic, paperless, transfer of money (electronic funds transfer - EFT) between companies in response to an invoice or other obligation.
Electronic Mail
Mail or messages sent electronically, frequently cited as e-mail.
Electronic Transfer
SEE: Electronic Data Interchange.
Electrostatic Treater
An emulsion treating vessel that utilizes an electrical grid and usually a fire tube to coalesce the fluid. This type of treater usually operates at lower temperatures than ones without grids.
Elemental Analysis
Parameters derived during organic geochemical analysis.
Elevation
The distance above a specified reference datum, commonly the surface of the earth or mean sea level. A positive value denotes a point higher than the reference point. When given without specifying a reference value, it is assumed that the elevation is referenced to mean sea level
Elevation Negative Sign
A data field that contains a negative sign (-) if the elevation of the identified entity is below sea level.
Elevation Reference Point Code
An indicator of a point in, on, or closely associated with a well, from which depths along a wellbore path are measured (the zero measurement point) or at which the elevation datum (with respect to mean sea level) is determined and recorded (the permanent elevation reference point); e.g., Bradenhead; Casing Flange; Derrick Floor; Estimated; Ground; Kelly Bushing; Rotary Bushing; Rotary Elevation; Rotary Table; Sea Level; Topo Sheet Ground Estimate.
Elevation Statics
SEE: Field Statics.
Elevator
A hinged circle or latch block provided with long links to hang on the elevator hook used to hoist or lower drill pipe, casing, tubing, and sucker rods.
Ellipsoid
Mathematical surface to which coordinates are referenced. Defined by an ellipsoid of revolution which is revolved about its minor axis and which approximates to the earth's surface, devoid of topographic undulations. Examples: Clarke-1866; GRS-80; International-1924.
Ellipsoid Name
Reference ellipsoid and year on which the latitude and longitude are based; e.g., Clarke-1866.
Elution
The extraction from an adsorbent by using a solvent.
Email
SEE: Electronic Mail.
Email Address
SEE: E-Mail Address.
Embedded Accounting
Accounting entries electronically generated as part of a non-accounting business activity instead of being treated as a separate business activity.
Emergency Gas Relief System
A system for discharging gas by manual actuation or by an automatic pressure relief valve from a pressurized system to the atmosphere for the purpose of relieving an abnormally high pressure.
Emergency Pits Count
The number (count) of emergency pits on a facility. These pits must be approved and normally must be emptied within 24 to 48 hours.
Emergency Shutdown System
A system of manual stations which, when activated, initiate system shutdown. Commonly referred to as: ESD System.
Emi Inspection
A colloquial expression for new pipe inspection performed with an inspection unit having these four scanners: (1) Rotating scanner for detection of longitudinal defects.(2) Fixed scanner for detecting transverse defects.(3) Rotating scanner for wall thickness measurement.(4) Grade verifier or comparator (optional).
Emission Factor
The average amount of a pollutant emitted from each type of polluting source in relation to a specific amount of material processed.
Emission Standard
The maximum amount of a pollutant legally permitted to be discharged from a single source either mobile or stationary.
Emulsifier
A substance used to produce an emulsion of two liquids which do not mix. Emulsifiers may be divided, according to their behavior, into ionic and nonionic agents. The ionic types may be further divided into anionic, cationic, and amphoteric, depending upon the nature of the ion active groups. Also referred to as: Emulsifying Agent.
Emulsion
A mixture of two immiscible liquids; i.e., liquids which do not mix together under normal conditions.
Emulsoid
Colloidal particles which take up water.
Encircling Coil
A coil surrounding the pipe under test.
Enclosed And Gasketed Busway
An enclosed and gasketed, grounded metal enclosure containing factory mounted, bare or insulated conductors which are usually copper or aluminum bars, rods, or tubes.
Enclosed And Gasketed Lighting Fixtures
Lighting fixtures (formerly referred to as vapor tight) designed to prevent the entrance of gas and vapors. Such enclosures will not absolutely prevent the entrance of gases and vapors, as such tend to breathe as they are heated and cooled.
Enclosed Area
A three dimensional space enclosed by more than two-thirds (2/3) of the possible projected plane surface area and of sufficient size to allow the entry of personnel. For a typical building, this would require that more than two-thirds (2/3) of the walls, ceiling, and/or floor be present.
Enclosure
A structure which may provide environmental protection for the machine.
End And Outlet Connection
(1) Integral threads, male or female.(2) Flanges, studded or through bolted used to join together equipment that contains or controls pressure.
End Damage
Damage to the pipe, such as during loading, unloading or that resulting from longitudinal shifting of the load and striking a bulkhead or an adjacent pipe pile.
End Effect
The reduction in magnetization near the ends of a length of magnetized pipe due to the demagnetizing effect of the poles at the pipe ends.
End- Point
Indicates the end of some operation or when a definite change is observed. In titration, this change is frequently a change in color of an indicator which has been added to the solution or the disappearance of a colored reactant.
End Point Temperature Measurement
The maximum temperature readsing obtained during the distillation test.
End- Point (titration)
The point at which the last of a substance whose quantity is being determined has reacted with a measured amount of a standard reagent. Normally indicated by the change taking place in the color of an indicator when reaction is completed.
End User
Ultimate consumer and user of natural gas. An end user purchases the gas for consumption but not for resale purposes. Sometimes applied to a local distribution company (LDC).
Ending Inventory Flag
An indicator of whether there is an ending inventory of condensate on hand at the time of workover or recompletion.
Ending Inventory Volume
The measured or calculated quantity of oil and/or condensate in storage tanks at the end of a specific period.
Ending Test Date
The date that the identified test was completed. Tests include drillstem test, formation test, reservoir limits, etc.
Ending Test Time
The end time in hours, minutes of the test.
Ending Tract Number
The ending tract number assigned by the Minerals Management Service (MMS) at the time of a lease sale to identify a leasable component as a single bidding entity in a particular lease sale. A tract may be comprised of one block or of portions of several blocks as long as the total acreage in one entity does not exceed 5,760 acres.
Engine Analyzer
Electronic diagnostic equipment for compressors and compressor drivers.
Engineer (mud Or Drilling Fluid)
An individual versed in drilling fluids whose duties are to manage, carry through, and maintain the various types of well drilling fluid programs.
Engineering
The science or application of science to planning, constructing or using machinery, structures or other functional assemblies.
Enhanced Recovery
Recovery methods for minerals which go beyond the more conventional secondary recovery techniques of pressure maintenance and water flooding. Enhanced recovery methods now being employed include micellar surfactant, steam drive, polymer, miscible hydrocarbon, CO2, and steamsoak.
Enriched Gas Drive
The injection into a reservoir of fluids (usually liquefied petroleum gases--LPG) that will mix with the native reservoir fluid to displace oil that would not be recovered with natural reservoir energy. Also referred to as: Miscible Displacement Operation.
Ensemble
Historical. SEE: Gather.
Entitlement
Working interest owner's share of production. This volume may not equal actual sales due to contractual or market conditions.
Entity Identifier Code
An indicator of the business function of the company ; e.g., operator, lessee, purchaser, etc.
Entrained Gas
Gas suspended in bubbles in a stream of liquid such as water or oil.
Entrained Liquid
A mist size liquid droplet occurring in a gas stream. Special designed separators, with a mist extractor, are used to remove the liquid from the gas stream.
Entrainment
(1) The picking up and carrying along to where it is finally deposited.(2) The trapping of gas bubbles in a cement slurry.(3) The trapping of water droplets or mist in a gas stream.
Environment
The sum of all external conditions and influences affecting the life, development, and ultimately the survival of an organism.
Environmental Action Cost
Costs associated with meeting environmental regulations.
Environmental Impact Statement
A document prepared by a Federal agency on the environmental impact of its proposals for legislation and other major actions significantly affecting the quality of the human environment. Environmental impact statements (EIS's) are used as tools for decision making and are required by the National Environmental Policy Act.
Environmental Protection Agency
An Agency of the U.S. Federal Government, commonly abbreviated EPA.
Environmental Seal
A seal which uses O-rings, epoxy, molded elastomer, silicone compound, or potting compound to prevent corrosion due to moisture or vapors.
Epa
SEE: Environmental Protection Agency.
Equalizing Feature
A subsurface safety valve (SSSV) mechanism which permits the well pressure to bypass the SSSV closing element to aid in opening the valve.
Equipment
Devices for service within specific applications or tasks.
Equipment Packing
Any compressible material used to obtain a tight, leakproof seal around pump shafts, valve stems, etc.
Equipment Series
Groupings of equipment; i.e., flanges, flanged valves, etc., based on size, material makeup, nominal pressure, etc. Groupings are established by American Standards Association (ASA).
Equipment Test
Describes the various types of tests performed on casing strings, drillstrings, blowout preventers, tubing strings, and Christmas trees.
Equipping Cost
Monies expended beyond completion costs, to acquire and install equipment required to produce petroleum substances from the well including the pump (or other artificial lift equipment), the acquisition and installation of flow lines and production tankage serving the well and where necessary a heater, dehydrator, or other facility for the initial treatment of the petroleum substances produced from the well to prepare such production for transport to market, but specifically excluding costs incurred beyond
Equivalent Circulating Density
For a circulating fluid, the equivalent circulating density in lb/gal equals the hydrostatic head (psi) plus the total annular pressure drop (psi) divided by the depth (ft) and by 0.052.
Equivalent Spherical Diameter
The theoretical dimension usually referred to when the sizes of irregularly shaped small particles are discussed. These dimensions can be determined by several methods; e.g., settling velocity; electrical resistance; light reflection.
Equivalent Weight
The atomic or formula weight of an element, compound, or ion divided by its valence. Elements entering into combination always do so in quantities proportional to their equivalent weights. Also referred to as: Combining Weight.
Erection Load
The load produced in the mast and its supporting structure during the raising and lowering operation.
Eroded Orientation Pockets
Enlargements made on one side of the borehole by jetting methods.
Erw Pipe
Pipe having one longitudinal seam formed by electric flash welding or electric resistance welding, without the addition of extraneous metal.
Estimate Indicator Flag
An indicator of whether a reported line is related to a previous month's estimate.
Estimated Farm-out Deal Cost
The estimated cost of a farm-out deal associated with a specific exploratory well.
Estimated Gas Rate Per Well Test After Work
The estimated volume of gas anticipated to be produced during a well test, calculated over 24 hours, after the proposed work has been completed.
Estimated Oil Or Condensate Rate Per Well Test After Work The Estimated Volume Of Oil/condensate Anticipated To Be Produced During A Well Test, Calculated Over 24 Hours, After The Proposed Work Has Been Completed.
Estimated Recovery
The estimated quantity of oil or gas that a reservoir, a field, or a property will produce.
Estimated Royalty Payment Amount
The amount of the estimated payment. This is an approximation of the royalty due when actual production figures are unavailable or are normally received too late for timely reporting.
Estimated Royalty Payment Flag
An indicator that the amount of royalty payment is an estimated amount.
Estimated Tax Payment Amount
The amount of taxes estimated and paid for a sales month and year.
Estimated Tax Payment Previously Remitted Amount
The amount of taxes estimated and paid previously for a sales month and year.
Estimated Ultimate Gas Yield
The ultimate gas yield estimated for the life of the reservoir/field/lease.
Estimated Water Rate Per Well Test After Work
The estimated volume of water anticipated to be produced during a well test, calculated over 24 hours, after the proposed work has been completed.
Estuary
An area where the fresh water meets salt water; e.g., bay; mouth of rivers; salt marsh; lagoon. An estuary is a delicate ecosystem. Estuaries serve as nurseries or spawning and feeding grounds for a large group of marine life and provide shelter and food for birds and wildlife.
Evaporation Pond
Shallow, artificial ponds into which liquids or aqueous suspensions are pumped, permitted to dry, and either removed or buried by more added materials.
Evaporation Rate
The quantity of produced water which can be evaporated through atmospheric processess adjusted for annual rainfall.
Evaporator
A vessel, usually steam heated, for the production of steam which is subsequently condensed for boiler makeup.
Event Activity
An activity that takes place at a single datetime associated with it.
Event Activity Datetime
The datetime associated with the event activity.
Event Occured Time
The time of day that an event occurred, in hours and minutes.
Event Sequence
A suppplemental operation performed on a wellbore, such as redrill, deepen, recomplete or rework. Used by the API Well Numbering System. Also Known as: Hole Change.
Event Sequence Code
(1) The event sequence code (column 16 of the CPA well number) for Saskatchewan wells is reported as follows: 0 = original oilwell; 1 = re-entry; 2 = recompletion oil to oil (plug-back); 3 = second recompletion oil to oil; 4 = dual (also twin if two strings of casing are used in the same borehole. Do not use for twin wells which have separate wellbores as the difference is indicated in the quad.); 5 = gas; 6 = water; 7 = water injection.(2) Columns 13 and 14 of the API Well Number: A non-unique op
Evergreen Clause
Provision which extends the life of the contract after the primary term has expired. As a rule, the clause will provide that the terms of the contract will remain in effect until a written notice of termination (required) is furnished by one party to the other.
Exception Required Flag
An indicator of whether or not a regulatory exception will be required for the project.
Excess Butane
SEE: Free Butane.
Excess Capacity Volume
The difference in the amount of gas between the producer's deliverability capacity and the purchaser's nominations.
Excess Temperature
Temperature in a process component in excess of the rated working temperature.
Excessive Reinforcement
Outside weld beads which extend above the prolongation of the original surface of the pipe. Also referred to as: Excessive Overfill.
Exchange Agreement
Agreement between producers providing for the exchange of gas produced from one property or interest for gas produced from another property or interest.
Exchange Gas
Gas exchanged under provisions of an exchange agreement.
Exempt Interest
An interest owned in a property, usually by a charitable or governmental agency, which is not subject to state production taxes as provided in the applicable tax regulations. Differs from a Tax Free Interest.
Existing Contract
Under the Natural Gas Policy Act (NGPA), 1978, as amended, any contract for the first sale of natural gas in effect on November 8, 1978, the day before the date of the enactment of the NGPA.
Exit Duct
SEE: Overflow Opening.
Expanded Perlite
A siliceous volcanic rock that is ground to small size and subjected to extreme temperature in an oven, resulting in an expansion and release of combined water, leaving the rock particle considerably expanded and porous.
Expander
A high speed turbine device generating extreme cold temperatures in a cryogenic plant by rapidly reducing the pressure of the inlet gas stream thereby expanding the volume.
Expander Shaft
The center section rotating assembly of an expander comprised of shaft, compression and expansion wheel.
Expander Unit
SEE: Fuel Gas Treating Unit.
Expansion Bellows
A corrugated piping device designed for absorbing expansion and contraction.
Expansion Bend
A piping configuration designed to absorb expansion and contraction.
Expansion Joint
A device used to permit linear expansion or contraction as the temperature rises or falls.
Expansion Liquid Volume
Volume fraction of liquid hydrocarbon present at the given temperature and pressure.
Expansion Loop
A bend placed in a line to absorb line movement or line crawl due to expansion and contraction of the pipe.
Expansion Pressure Measurement
Pressure at which the liquid volume measurement was made.
Expansion Temperature
Temperature at which the liquid volume measurement was made.
Expected Action Date
The month and year when the action will occur.
Expenditure Limit Amount
The contractual amount provided in the operating agreement which the operator of a joint interest account can spend for one repair or construction without securing the nonoperators' approval.
Experimental Permeability Ratio
The experimental permeability ratio (kp/kd) is the ratio of the perforated effective permeability to the original effective permeability. These permeabilities are determined from flow tests on the core target.
Expiration Date
The date of expiration.
Exploration
The process of searching for minerals, including: (1) Geophysical surveys where magnetic, gravity, seismic or other systems are used to detect orimply the presence of such minerals. (2) Any drilling, whether on or off known geological structures, including the drilling of a well in which the discovery of oil or natural gas in paying quantities is made and the drilling of any additional delineation well after such discovery which is needed to delineate any reservoir and to enable the lessee to determine
Exploration Program
Geological, geophysical, and geochemical examinations and other investigations relating to geology, and any related environmental studies, other than drilling, conducted under the terms of the agreement.
Exploration Project Name
The name of an exploration program or project.
Exploratory Unit
An administrative unit involving undeveloped oil and gas properties embracing a structure or block of lands considered potentially productive, which is formed, due to the diversity of ownership, so that development and operations may be conducted and the expense shared on a fieldwide basis, and in the interest of conservation.
Exploratory Well
A well drilled in an unproven area, or to find a new reservoir in a field already productive, or to significantly extend a known reservoir.
Explosion Proof Enclosure
An enclosure which is capable of withstanding an explosion of a gas or vapor within it and of preventing the subsequent ignition of a flammable gas or vapor which may surround it, and which operates at such an external temperature that a surrounding flammable gas or vapor will not be ignited.
Explosive Limit
The explosive limits of a gas or vapor are the lower and upper percentages by volume of concentration of gas in a gas and air mixture that will form an ignitible mixture.
Extended Reach Drilling
A special drilling technique in which the horizontal wellbore component is significantly greater than the vertical component.
Extension Well
A well drilled for the purpose of extending the proven limits of a known reservoir to include the unproven area being tested.
External Authorization Date
The month, day, year on which the official authority has received all written or verbal approvals to proceed with a specific work activity from working interest partners.
External Guyline
Lines which provide stability and run from some point in the derrick, mast, or pole to ground anchors or to a special substructure or derrick base which provides a substitute for ground anchors.
External Thread
A thread on the outside surface of a pipe.
External Upset
An extra thick wall at the threaded end of drill pipe or tubing. Externally upset pipe does not have a uniform outside diameter throughout its length but is enlarged at each end.
Extra Weight Drill Pipe
(Registered trademark of Reed Drilling Tools, Inc.) Commercial name for a particular manufacturer's heavy weight drill pipe.
Extraction
The percent of a given component of the plant inlet gas which is removed from the gas stream by absorption or condensation.
Extraction Loss
SEE: Shrinkage.
Extraneous Gas
(1) Gas injected into a reservoir other than the reservoir from which produced.(2) Gas used in the operations of a lease other than the lease from which produced.
Extrapolated Thickening Time
The time required for a cement slurry to reach a consistency of 100 Bearden units of consistency (Bc) obtained by extending the curve recorded during a thickening time test which may be stopped at 70 under given conditions.
Extreme Platform Offset
An estimated maximum offset of the platform corresponding to given environmental conditions.
Extreme Pressure Lubricant
Additives which, when added to the drilling fluid, impart lubrication to the bearing surfaces when subjected to extreme pressure conditions.
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